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问题: 名词性从句2

The old lady's hand shook frequently.She explained to her doctor_____this shaking had begun half a year before,and___,only because of this,she had been fored to give up her job.
A.when;how
B.how;when
C.how;how
D.why;why
选项和详解。

解答:

The old lady's hand shook frequently.She explained to her doctor_____this shaking had begun half a year before,and___,only because of this,she had been fored to give up her job.
A.when;how
B.how;when
C.how;how
D.why;why
答案:C
译文:老太太的手经常颤抖,她向医生解释道这种颤抖在半年前是怎样开始的,并且因为这个,她是如何被迫辞掉工作的.
解析:第一空后有时间状语half a year before ,所以不用when.如果老太太都能知道为什么这个原因她就不会来看病了,所以不用why,而应该用how.
第二个空前有连词"and",那么后面部分同样承接前边的内容,作谓语"explained"的并列宾语.所以同样用how.